Found it and fixed it. Thanks for brightening the light bulb, Linda.

includes/modules/shipping/usps.php


/*
$methods[] = array('id' => $type,
'title' => ((isset($this->types[$type])) ? $this->types[$type] : $type),
'cost' => ($cost + MODULE_SHIPPING_USPS_HANDLING) * $shipping_num_boxes);
*/
/*
$cost = preg_replace('/[^0-9.]/', '', $cost);
$methods[] = array('id' => $type,
'title' => $title,
'cost' => ($cost * $shipping_num_boxes) + (MODULE_SHIPPING_USPS_HANDLING_METHOD == 'Box' ? MODULE_SHIPPING_USPS_HANDLING * $shipping_num_boxes : MODULE_SHIPPING_USPS_HANDLING) );

}

$this->quotes['methods'] = $methods;
*/

/* Minimum USPS Shipping */
if ($cost < 6.00) {
$methods[] = array('id' => $type,
'title' => $title,
'cost' => (6.00 + MODULE_SHIPPING_USPS_HANDLING) * $shipping_num_boxes);
} else {
$methods[] = array('id' => $type,
'title' => $title,
'cost' => ($cost + MODULE_SHIPPING_USPS_HANDLING) * $shipping_num_boxes);
}
}

$this->quotes['methods'] = $methods;
/* EOF Minimum USPS Shipping */